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Note 3 - Recent Accounting Pronouncements (Details Textual) - Computer Software, Intangible Asset [Member]	9 Months Ended
	Mar. 31, 2021
Minimum [Member]
Finite-lived Intangible Assets, Renewal Period (Year)	1 year
Maximum [Member]
Finite-lived Intangible Assets, Renewal Period (Year)	3 years

X

- Definition

The period for renewal of finite-lived intangible asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	eth_FinitelivedIntangibleAssetsRenewalPeriod
Namespace Prefix:	eth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: